public byte[] ReadEV3File(String fullname, ByteCodeBuffer pingercommand = null)
{
long nextping = DateTime.Now.Ticks + 500;
int chunksize = 900;
// start the transfer
BinaryBuffer b = new BinaryBuffer();
b.Append16(0); // transfer no content right now
b.AppendZeroTerminated(fullname);
byte[] response = SystemCommand(BEGIN_UPLOAD, b);
if (response == null)
{
throw new Exception("No response to BEGIN_UPLOAD");
}
if (response.Length < 6)
{
throw new Exception("Response too short for BEGIN_UPLOAD");
}
if (response[0] != SUCCESS && response[0] != END_OF_FILE)
{
throw new Exception("Unexpected status at BEGIN_UPLOAD: " + response[0]);
}
int len = ((int)response[1]) + (((int)response[2]) << 8) + (((int)response[3]) << 16) + (((int)response[4]) << 24);
int handle = response[5] & 0xff;
// Console.WriteLine("Start uploading file of size: " + len + ". handle=" + handle);
byte[] buffer = new byte[len];
int pos = 0;
// transfer bytes in small chunks
while (pos < len)
{
int transfernow = Math.Min(len - pos, chunksize);
b.Clear();
b.Append8(handle);
b.Append16(transfernow);
response = SystemCommand(CONTINUE_UPLOAD, b);
if (response == null)
{
throw new Exception("No response to CONTINUE_UPLOAD");
}
if (response.Length < 2 + transfernow)
{
throw new Exception("Response too short for CONTINUE_UPLOAD");
}
if (response[0] != SUCCESS && response[0] != END_OF_FILE)
{
throw new Exception("Unexpected status at CONTINUE_UPLOAD: " + response[0]);
}
for (int i = 0; i < transfernow; i++)
{
buffer[pos + i] = response[2 + i];
}
pos += transfernow;
// check if it is necessary to send intermediary pings to the watchdog program
if (pingercommand != null && DateTime.Now.Ticks > nextping)
{
DirectCommand(pingercommand, 4, 0);
nextping = DateTime.Now.Ticks + 500;
}
}
return(buffer);
}
